Common Bridge Rectifier Testing Methods

Common Bridge Rectifier Testing Methods

1. Test the rectifier circuit, find the p terminal and N terminal of the DC power supply inside the inverter, adjust the multimeter to resistance X10, connect the red pen to P and the black pen to R , S and T. The resistance value should be about a few tens of ohms and is basically balanced. Conversely, if the black watch bar is connected to P in sequence and the red watch bar is connected to R, S and T in sequence, the resistance value is close to infinity. Connect the red pen to the N terminal and repeat the above steps to obtain the same result.

A circuit may be judged to be abnormal if the following results are obtained：

① the three phase resistance is unbalanced, which may indicate a fault in the rectifier bridge.

② the resistance is infinite when the red pen is connected to the P terminal, this can determine if the rectifier bridge is faulty or if the starting resistor is faulty.

2. In testing the inverter circuit, the red pen stick connected to the P terminal and the black pen connected to U, V and W respectively should have a resistance value of tens of ohms and essentially the same resistance value for each phase, the reverse phase should be infinite. Connect the black pen to the N terminal and repeat the above steps to obtain the same result, otherwise the inverter module can be identified as faulty.

常见的整流桥检测方法

1. 测试整流器电路，找到逆变器内部直流电源的p端子和N端子，将万用表调整为电阻X10，将红色表棒连接到P，将黑色表棒连接到R ，S，T。电阻值应约为几十欧姆，并且基本上是平衡的。相反，如果黑色表棒依次连接到P端，而红色表棒依次连接到R，S和T，则电阻值接近无穷大。将红色的手表棒连接到N端子，然后重复上述步骤以得到相同的结果。

如果有以下结果，则可以判断电路异常：

① 三相电阻不平衡，这可能表明整流桥出现故障；

② 当红色表棒连接到P端子时，电阻是无限的，这可以确定整流桥是否有故障或启动电阻是否有故障.

2. 在测试逆变器电路中，红色仪表棒连接到P端，黑色表棒分别连接到U，V和W上，应具有数十欧姆的电阻值，并且每相的电阻值基本相同，反相应该是无穷大。将黑色仪表条连接到N端子，然后重复上述步骤以得到相同的结果，否则可以确定逆变器模块故障。